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The author of the paper about chin's explanation, argue in this interview, than speach and chewing, is not enough https://italy.timesofnews.com/health-care/why-do-humans-have-chins-a-scientist-explains-the-enduring-puzzle I was wrong about elephant (and probably manatee) they dont have one : https://www.npwrc.org/why-do-humans-have-chins-a-scientist-explains-the-enduring-puzzle.html